Butterfly-shaped Ligands (IMAGE) Kyoto University Caption Butterfly-shaped ligands were the key to designing a material that can selectively absorb and store different gas molecules. Credit Illustration by Izumi Mindy Takamiya Usage Restrictions CC BY 4.0 License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.